C# 重复的序列化和反序列化会创建重复项

大家好，我的json序列化有问题。我正在Unity下使用Json.NET包：我正在搜索一个数据库，在我的应用程序上可编辑，并通过wwwForm和一个php文件存储在我的服务器上。我没有问题去创造它，并把它推到网上。问题是，当我加载它时，数据库的末尾有一个新条目。数据库类如下所示：

public class Database   {
    public List<Army> armies { get; set;}

    public Database() {
        armies = new List<Army>();
        armies.Add (new Army());
    }
}

public class Army
{
    public string faction { get; set;}
    public List<Unit> army { get; set;}

    public Army()
    {
        faction = "RED";
        army = new List<Unit>();
        army.Add (new Unit());
    }
}

public class Unit
{
    public string name { get; set;}
    public float fissionTimer { get; set;}
    public float HP { get; set;}
    public int shield { get; set;}
    public float strenght { get; set;}
    public float movSpeed { get; set;}
    public float attackSpeed { get; set;}
    public float farmAggro { get; set;}
    public int criticPossibility { get; set;}
    public int armorPenetration { get; set;}
    public bool isContagious { get; set;}
    public int contagePossibility { get; set;}
    public string imgName {get;set;}

    public Unit()
    {
        name = "standard";
        fissionTimer = 8;
        HP = 100;
        shield = 0;
        strenght = 10;
        movSpeed = 5;
        attackSpeed = 0.1f;
        farmAggro = 0.1f;
        criticPossibility = 0;
        armorPenetration = 0;
        isContagious = false;
        contagePossibility = 0;
        imgName = "Red";
    } 

    public Unit(string _name, float _fissionTimer, float _HP, int _shield, float _strenght, float _movSpeed, float _attackSpeed, 
                float _farmAggro, int _criticPossibility, int _armorPen, bool _iscontagious, int _contagePos, string _imgName)
    {
        name = _name;
        fissionTimer = _fissionTimer;
        HP = _HP;
        shield = _shield;
        strenght = _strenght;
        movSpeed = _movSpeed;
        attackSpeed = _attackSpeed;
        farmAggro = _farmAggro;
        criticPossibility = _criticPossibility;
        armorPenetration = _armorPen;
        isContagious = _iscontagious;
        contagePossibility = _contagePos;
        imgName = _imgName;
    }
}

---

有2个军队和2个单位。我哪里做错了？提前感谢

发生这种情况的原因是两件事的结合：

类构造函数会自动将默认项添加到各自的列表中。Json.Net在反序列化期间调用这些构造函数来创建对象实例

Json.Net的默认行为是在反序列化期间重用（即添加到）现有列表，而不是替换它们

要解决这个问题，您可以更改代码，使构造函数不会自动将默认项添加到列表中，或者配置Json.Net以在反序列化时替换列表，而不是重用它们。后者可通过将设置更改为

Replace

来完成，如下所示：

JsonSerializerSettings settings = new JsonSerializerSettings();
settings.ObjectCreationHandling = ObjectCreationHandling.Replace;

var database = JsonConvert.DeserializeObject<Database>(www.text, settings);

JsonSerializerSettings设置=新建JsonSerializerSettings（）；
settings.ObjectCreationHandling=ObjectCreationHandling.Replace；
var database=JsonConvert.DeserializeObject（www.text，settings）；

最好的方法是将JSON.Net配置为将默认值替换为

JsonSerializerSettings   jsSettings =  new JsonSerializerSettings
{
  ObjectCreationHandling = ObjectCreationHandling.Replace,
};

JsonConvert.DeserializeObject<Army>(jsonString, jsSettings);

JsonSerializerSettings jsSettings=新的JsonSerializerSettings
{
ObjectCreationHandling=ObjectCreationHandling.Replace，
};
反序列化对象（jsonString、jsSettings）；

如果要在构造函数中添加默认项，请尝试删除它们。但我只添加了一项。我这样测试：Database test=newdatabase（）//伪代码test.armies.count=1（正确）serialize-save-load-deserialize（不修改数据库test.arms.count？=2…为什么是2？另请参阅：FWIW我使用哈希集修复了它，因此不允许重复值（在我的例子中是枚举）。Thx很多，我只是删除了每个构造函数上的.add，就解决了它，但你教我json序列化是如何工作的；）有用且很好的回答，再次谢谢

JsonSerializerSettings settings = new JsonSerializerSettings();
settings.ObjectCreationHandling = ObjectCreationHandling.Replace;

var database = JsonConvert.DeserializeObject<Database>(www.text, settings);

JsonSerializerSettings   jsSettings =  new JsonSerializerSettings
{
  ObjectCreationHandling = ObjectCreationHandling.Replace,
};

JsonConvert.DeserializeObject<Army>(jsonString, jsSettings);